Of course. Bitcoin will be much more convenient for corruption, because nobody is regulated and all greedy people will use it.
How are you going to hide your income? If you keep bitcoins on your account, you will not see it, but what prevents you to open an anonymous account in dollars or euros? You get caught only when your expenses will exceed income. What's bitcoin?
When you use bitcoin it is much easier for corrupt people to do some corruption but not on big amounts but rather on average amounts only to avoid the eyes of the Central Banks. When using bitcoins you can just make a false description when sending then nobody will suspect you and it is much easier to carry it than checks or actual money.